Mathematical Problems in Engineering / 2019 / Article / Tab 4

Research Article

Model Updating of a Stitched Sandwich Panel Based on Multistage Parameter Selection

Table 4

Comparison of modal frequencies between refined and equivalent models.

Mode orderExperimental (Hz)Numerical
Refined model (Hz)Error (%)Equivalent model (Hz)Error (%)Diff. (%)

1189.90213.1712.25213.3212.33−0.02
2204.59125.05−38.88125.37−38.720.26
3387.64414.386.90415.237.120.21
4439.56322.22−26.69324.71−26.130.77
5583.81609.204.35610.974.650.29
6672.74578.64−13.99561.10−16.59−3.03

Error = (fr − fe)/fe × 100%; Error = (feq − fe)/fe × 100%; Diff. = (feq − fr)/fr × 100%; fr is the analytical frequency of the refined model; feq is the analytical frequency of the equivalent model; fe is the experimental frequency.

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